I bought an item online and the seller sent it to me without any postage, what can I do?

I received a notice from the post office that I had a parcel without any postage on it, no stamps etc. and that there is no return address listed, for me to receive the package I had to pay the full price of shipping again even though I already paid $50 in shipping on the website.. how do I deal with this, I want... show more I received a notice from the post office that I had a parcel without any postage on it, no stamps etc. and that there is no return address listed, for me to receive the package I had to pay the full price of shipping again even though I already paid $50 in shipping on the website.. how do I deal with this, I want to keep my item..
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